United States of Blooming Risks

An Aggregated Mosaic of FEMA National Risk Index of 18 Natural Hazards; Sister Map of "United States of Natural Disasters" (in NACIS 2024 Map Gallery)

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This comprehensive visualization of 18 U.S. natural hazards is a "sister map" of the award-winning map The United States of Natural Disasters.

Each universal hexagon unit in this map, including those in all inset maps, represents an area of 1,000 square miles. In this floral symbol, all 18 types of hazards are arranged along a color spectrum based on their mechanisms. Similar hazards are positioned closer, visually highlighting potential spatial patterns. Larger and darker petals represent a higher risk for a particular natural hazard.



The values within each hexagon are calculated as the weighted average of the original risk scores from FEMA’s National Risk Index (NRI) at the county level, with weights based on the proportion of the area that intersects with the counties.

The risk score for a specific hazard is proportional to the expected annual loss from that hazard, and the community resilience, while inversely proportional to the social vulnerability. To learn more about how FEMA's National Risk Index is calculated, visit their website.

Below are some trimmed images of different regions of the contiguous United States:

Northwest: Midwest: Northeast: Southwest: South: Southeast:

A printed version of this map was displayed in the Map Gallery of North American Cartographic Information Society 2024 Annual Conference at Tacoma, Washington.